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Thermal stresses and kinetics of phase transformation on the run-out table after hot strip rolling of low-carbon steels

Hasan Nasab, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s00170-015-7604-2
  3. Abstract:
  4. A thermo-elastic analysis coupled with a phase change model is employed to evaluate thermal stresses as well as progress of austenite decomposition after hot strip rolling operations. The thermo-mechanical finite element analysis is utilized to assess the distributions of temperature and thermal stresses during cooling while at the same time, a model based on the additivity rule is used to determine the rate of austenite to ferrite decomposition. The proposed model is applicable to multi-pass rolling schedules while the effects of different process parameters including the rolling speed and cooling configuration of the run-out table can be taken into account. In order to verify the predictions, the measured and predicted temperature-time diagrams are compared and a reasonable agreement is observed. The results show that significant variations occur in the thermal stresses in the period of austenite to ferrite transformation owing to changes in the thermo-physical properties such as the thermal expansion and Young modulus during continuous cooling
  5. Keywords:
  6. Finite element analysis ; Thermal stresses ; Austenite ; Carbon ; Cooling ; Ferrite ; Hot rolling ; Low carbon steel ; Stresses ; Strip metal ; Strip mills ; Temperature distribution ; Thermal expansion ; Thermal stress ; Austenite decomposition ; Austenite-to-ferrite transformation ; Cooling configuration ; Ferrite decomposition ; Kinetics of phase transformation ; Multi-pass rolling ; Thermo-physical property ; Thermoelastic analysis ; Finite element method
  7. Source: International Journal of Advanced Manufacturing Technology ; Volume 83, Issue 9-12 , 2016 , Pages 1725-1736 ; 02683768 (ISSN)
  8. URL: https://link.springer.com/article/10.1007/s00170-015-7604-2